57 lines
2.0 KiB
Ruby
57 lines
2.0 KiB
Ruby
module Vm
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module Assignment
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def on_IvarAssignment( statement )
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value = assignment_value(statement)
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name = check_name(statement.name.name)
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index = @method.for_type.variable_index( name)
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raise "No such ivar #{name} #{@method.for_type}" unless index
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value_type = @method.for_type.type_at( index )
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raise "Argument Type mismatch #{value.type}!=#{value_type}" unless value.type == value_type
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value_reg = use_reg(:value_type)
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add_slot_to_reg(statement , :message , :receiver , value_reg )
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add_reg_to_slot(statement , value , value_reg , index + 1 ) # one for type
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end
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def on_LocalAssignment( statement )
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do_assignment_for( statement , :local )
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end
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def on_ArgAssignment( statement )
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do_assignment_for( statement , :argument )
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end
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private
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def do_assignment_for( statement , type )
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value = assignment_value(statement)
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name = check_name(statement.name.name)
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index = @method.send( "has_#{type}" , name)
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raise "No such #{type} #{name} #{@method.inspect}" unless index
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value_type = @method.send("#{type}s_type" , index )
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raise "Argument Type mismatch #{value.type}!=#{value_type}" unless value.type == value_type
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move_reg(statement , "#{type}s".to_sym , value , index)
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end
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def move_reg(statement , type , value , index)
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named_list = use_reg(:NamedList)
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add_slot_to_reg(statement , :message , type , named_list )
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add_reg_to_slot(statement , value , named_list , index + 1 ) # one for type
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end
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def assignment_value(statement)
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reset_regs # statements reset registers, ie have all at their disposal
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value = process(statement.value)
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raise "Not register #{v}" unless value.is_a?(Risc::RiscValue)
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value
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end
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# ensure the name given is not space and raise exception otherwise
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# return the name
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def check_name( name )
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raise "space is a reserved name" if name == :space
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name
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end
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end
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end
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